LABORATORY REPORT
Subject of the exercise:
Basic Logic Circuits (Exercise 9.)
Date:
<year>. <month>. <day>
Location:
BME, lab.: Q. BP.109
Students name:
<name 1>
<name 2>
Group, Desk No.
Group: <No.>, Desk: <No.>
Supervisor:
<name>
Measurement instruments
Digital multimeter (3½ digit)
METEX ME-22T
Power supply
Agilent E3630
Oscilloscope
Agilent 54622A
Function generator
Agilent 332220A
Test board
VIK-07
Laboratory exercises
1. Measurement of voltage transfer characteristic for several inverter IC type
1.1. Make the evaluation board ready for the measurement: connect a 5V power (to
Vcc) and GND (to GND) to the Evaluation board using the Agilent E3630 power
supply (Measure the supply voltage before connecting it !!!).
1
Figure 9–1.: Measurement setup of exercise 1.
1.2. Place a TTL inverter to the inverter socket (bottom left). Use the Agilent 332220
function generator to create a 0V to 5V triangle wave at the frequency of 350
Hz. Measure the generated signal before connecting it, because the improper
selection of function generator’s load could cause problems!!! Connect the
stimulus to the input of the inverter chain. Measure the voltage transfer
characteristic of the first inverter using the XY mode of the oscilloscope (Figure
9.4). Do not connect load to the inverters output.
<your comments>
1.3. Connect a 10 gate load (“10 kapu terhelés”) to the output of the first inverter.
Measure the effect of this modification!
<your comments>
1.4. Perform the following measurements for at least 2 TTL and 2 CMOS circuits!
Measure the logic High and Low voltage levels, measure the High-to-Low, and
Low-to-High switching points. Make conclusions on differences.
<your comments>
Measurement results:
Type of IC
SN7404N
74LS04N
DM74LS14N
MM74HC04N
2
Switching point
UL
UH
Exercise 9.
2. Measure the power consumption of several inverters. Repeat this
measurement for different input signal frequencies.
Figure 9–2.: Measurement setup of exercise 2.
2.1. Use the Agilent 332220 function generator to create a 0V to 5V square wave at
the frequency of 100 Hz. Measure the generated signal before connecting it!
Connect a multimeter in current measurement mode between the power supply
and the evaluation board. Measure the static power consumption of the
evaluation board (unlock and remove the inverter IC). Place the inverter circuit
back, and make the power consumption measurement. Repeat the
measurement at 1kHz, 10KHz, 100Khz, 1MHz.
I_cc [mA]
TTL ICs:
1,20
1,00
0,80
0,60
0,40
0,20
0,00
SN7404N
SN74LS04
1
10
100
1000
10000
100000 1000000
f_be [Hz] .
CMOS ICs:
3
1,2
I_cc [mA]
1
0,8
MM74HC04
0,6
0,4
0,2
0
1
10
1000
100
10000 100000 1E+06
f_be [Hz] .
2.2. Make conclusions on the power consumption change of TTL inverters!
<your comments>
2.3. Make conclusions on the power consumption change of CMOS inverters!
<your comments>
3. Measurement of delays
3.1. The measurement setup is the same as the previous exercise, except connect
a 10 gate load to the last (6th) inverter. Use the Agilent 332220 function
generator to create a 0V to 5V square wave at the frequency of 100 Hz.
Measure the generated signal before connecting it! Measure the delay at the 6th
inverter, and calculate the average delay of one inverter.
3.1.1. Connect a capacitive load to the first inverter and perform the above
measurement for several IC type. What are the effects of the capacitive
load on the first inverter?
Type of IC
L-H delay
H-L delay
fall time
rise time
MM74HC04
SN7404N
SN74LS04N
DM74LS14N
Type of IC
MM74HC04
SN7404N
4
Exercise 9.
SN74LS04N
DM74LS14N
<your comments>
4. Measurements on Flip-flops (SN7474)
4.1. Insert a flip-flop IC to the flip-flop socket on the middle of the evaluation board.
Identify the pins of the flip-flop by using the pin setup diagram at the back of this
paper!
4.2. Design and implement measurement setups for setup time, hold time, and
propagation time measurements by using the embedded pulse generator block
of the evaluation board!
<your comments>
Auxiliary measurement exercises
5. Measure the load and supply voltage dependence of the power consumption
of logic circuits. (Auxiliary for exercise two)
5.1. Connect a capacitive load to the first inverter and perform the power
consumption measurement described at exercise 2.
type of IC
100 Hz
1 kHz
10 kHz
100 kHz
500 kHz
SN7404N
MM74HC04
<your comments>
5.2. Measure the power supply voltage dependence of CMOS logic circuits. Use the
measurement setup described at exercise 2, with the input signal frequency of
1MHz. Reduce the power supply voltage from 5V to 4.5V, 4V, 3.5V and
measure the power consumption of the logic circuit. Do not forget the measure
the base power consumption of the Evaluation board each time before
calculating the inverter circuit power consumption! Do not raise the power
supply voltage above 5V!
Type of IC
5V
4.5V
4V
3.5V
3V
MM74C04N
5